Iotuba fossil map
Where fossils of Iotuba have been found, shown on the Earth as it looked about 525 million years ago and on today’s map.
Dots are fossil collections recorded in the Paleobiology Database. The “then” view moves today’s fossil sites back to their positions 525 million years ago (the time slice nearest the median age of the fossils) using the Merdith et al. (2021) plate model; positions are approximate. Open on the timeline map →
| Group | Ediacaran & Cambrian life |
|---|---|
| Lived | 521–514.5 million years ago (Stage 3) |
| Periods | Cambrian |
| Named by | Zhang et al. 2023 |
| Fossil records | 3 occurrences at 3 locations (PBDB) |
| Found in | China |
| Rock formations | Heilinpu |
About Iotuba
Iotuba chengjiangensis (sometimes mis-spelt Lotuba) is a 515 million year old Cambrian worm known from the Chengjiang biota. Originally interpreted as a phoronid, the organism is now recognized as an annelid cage worm affiliated with the Flabelligeridae and Acrocirridae, which Zhang et al grouped together in the new superfamily Flabelligeroidea.
Text in “About” is quoted from the Wikipedia article Iotuba (revision 1305914986), licensed under CC BY-SA 4.0; introduction excerpted verbatim, formatting removed. Ages, family, authority and fossil records: Paleobiology Database, accessed 23 October 2026. Ages are those of the rock layers the fossils were found in. Wikidata: Q28431957.
